LM4990LD/NOPB Equivalent & Substitute Parts

Part Overview

The LM4990LD/NOPB is a Class AB mono audio amplifier IC manufactured by Texas Instruments, designed for low-power audio applications requiring 2W output at 4Ohm load impedance. This device operates across a 2.2V to 5.5V supply voltage range and is housed in a 10-WSON (3x4) surface mount package. The part is classified as Obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility while meeting current component availability and compliance standards.

Substiute Parts

LM4990LD/NOPB

Texas InstrumentsIn Stock: 5280LM4990LD/NOPB Datasheet

Current PartRFQ

TPA6211A1DRBR

Texas InstrumentsIn Stock: 44187TPA6211A1DRBR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM4990LD/NOPB is determined by the following critical parameters:

Functional Compatibility Criteria:

• Amplifier topology: Class AB configuration
• Channel configuration: Single-channel (mono) output
• Supply voltage overlap: Minimum 2.5V to 5.5V operating range
• Operating temperature range: -40°C to 85°C
• Surface mount technology compatibility

Regulatory & Compliance Criteria:

• RoHS3 compliance status
• REACH unaffected classification
• EAR99 export control designation

The TPA6211A1DRBR qualifies as a direct substitute based on matching amplifier class, mono output topology, overlapping supply voltage specifications, identical operating temperature range, and equivalent regulatory compliance. While output power specifications differ (3.1W @ 3Ohm versus 2W @ 4Ohm), the substitute provides enhanced performance within the same functional category and is currently in active production status.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: TPA6211A1DRBR

The TPA6211A1DRBR is the manufacturer-recommended substitute for the obsolete LM4990LD/NOPB. Selection of this alternative is supported by the following engineering factors:

Product Status & Availability: The TPA6211A1DRBR maintains active production status with 44,100 units in current inventory, ensuring long-term supply chain continuity compared to the obsolete LM4990LD/NOPB.

Regulatory Compliance: Both devices maintain identical RoHS3 compliance, REACH unaffected status, and EAR99 export classification, eliminating compliance-related redesign requirements.

Functional Equivalence: Both amplifiers operate as Class AB mono audio amplifiers across overlapping supply voltage ranges (-40°C to 85°C operating temperature). The TPA6211A1DRBR provides enhanced output power capability (3.1W @ 3Ohm) relative to the original specification (2W @ 4Ohm), representing a performance upgrade within the same functional category.

Package Consideration: The TPA6211A1DRBR uses an 8-VDFN Exposed Pad package versus the original 10-WFDFN Exposed Pad. PCB layout modification is required to accommodate the different package footprint and pin configuration.

Frequently Asked Questions (FAQ)

Q: Can the TPA6211A1DRBR directly replace the LM4990LD/NOPB without circuit modifications?

A: The TPA6211A1DRBR provides functional substitution as a Class AB mono amplifier with compatible supply voltage and operating temperature specifications. However, PCB layout redesign is mandatory due to different package types (8-VDFN versus 10-WFDFN) and pin configurations. Circuit topology review is required to verify compatibility with existing input/output signal conditioning.

Q: What are the key differences in output power specifications?

A: The LM4990LD/NOPB delivers 2W at 4Ohm load impedance. The TPA6211A1DRBR delivers 3.1W at 3Ohm load impedance. Output power varies with load impedance; direct comparison requires load-specific analysis for your application.

Q: Are both devices RoHS compliant?

A: Yes. Both the LM4990LD/NOPB and TPA6211A1DRBR maintain ROHS3 compliance status, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: What is the moisture sensitivity difference between these parts?

A: The LM4990LD/NOPB has MSL 3 (168 Hours) rating. The TPA6211A1DRBR has MSL 2 (1 Year) rating, indicating lower moisture sensitivity and more favorable handling and storage conditions for the substitute part.

Q: Does the TPA6211A1DRBR include additional features?

A: Yes. The TPA6211A1DRBR includes Differential Inputs and Thermal Protection features in addition to the Depop and Shutdown functions present in the original LM4990LD/NOPB. These additional features provide enhanced signal conditioning and thermal management capabilities.

Q: What supply voltage range overlap exists between these devices?

A: The LM4990LD/NOPB operates from 2.2V to 5.5V. The TPA6211A1DRBR operates from 2.5V to 5.5V. The overlapping range is 2.5V to 5.5V. Applications requiring operation below 2.5V require circuit redesign or alternative component selection.